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<?php $arr = Array ( '2018-10-18' => 5, '2018-10-19' => 5, '2018-10-20' => 5, '2018-10-27' => 5, '2018-10-28' => 4, '2018-10-29' => 4, '2018-11-03' => 4 ); Foreach(array_unique($arr) as $v){ $temp = array_keys(array_intersect($arr, [$v])); $new[] = ['start' => current($temp), 'end' => end($temp), 'value' => $v]; } var_dump($new);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> array(3) { ["start"]=> string(10) "2018-10-18" ["end"]=> string(10) "2018-10-27" ["value"]=> int(5) } [1]=> array(3) { ["start"]=> string(10) "2018-10-28" ["end"]=> string(10) "2018-11-03" ["value"]=> int(4) } }

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